Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Saha, Abhishek; Manikyamba, C.; Santosh, M.; Ganguly, Sohini; Khelen, Arubam C.; Subramanyam, K.S.V.

doi:10.1016/j.jseaes.2015.01.020

Cited by 32 publications

(22 citation statements)

References 156 publications

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“…The S-undersaturated character of Bababudan komatiites is attributed to decompression and assimilation of lower crustal materials during magma ascent and emplacement. On the contrary, geochemical features such as higher Al 2 O 3 and Pd contents, lower Cu/Pd (Gd/Yb) N values, and negative Nb-, Zr-, Hf, Ti anomalies of the boninites imply high degree of H 2 O saturated melting of the refractory mantle wedge, wherein influx of subduction-derived fluid and sulfide retention in the residual mantle were the causative factors for their S-under saturated nature (Saha et al, 2015).…”

Section: Chromite and Pge Oresmentioning

confidence: 99%

Metallogeny

Mishra¹

2016

Proceedings of the Indian National Science Academy

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This article briefly reviews all contributions by Indian geoscientists in the period 2011-2016 in the field Metallogeny. The contributions covered are mainly on deposits and prospects of chromite, PGE, gold and uranium. Very few contributions have been made on base metals. However, experimental sulfide phase equilibrium research, related to metamorphic remobilization of massive sulfides, has been initiated.

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Section: Chromite and Pge Oresmentioning

confidence: 99%

Metallogeny

Mishra¹

2016

Proceedings of the Indian National Science Academy

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“…One of the most important features of the Chitradurga Group is the abundance of BIFs, Mn formations and stromatolitic carbonates/cherts. Dharwar Supergroup komatiites have been reported from the Neoarchean Sigegudda greenstone terrane of WDC, komatiites and komatiitic basalts have been reported from the Sultanpura volcanic suite of ~2.7 Ga Sandur Superterrane occurring within the central part of ~2.6 Ga Closepet granite and komatiites have been reported from the Santavari Formation of the Bababudan greenstone terrane of WDC associated with picrites, Nb‐enriched basalts and adakites (Manikyamba et al, ; Manikyamba, Kerrich, Khanna, Krishna, & Satyanarayanan, ; Manikyamba, Kerrich, Polat, & Saha, ; Manikyamba & Saha, ; Saha et al, ). A Mesoarchean–Neoarchean komatiite‐boninite sequence has been documented from Kudremukh‐Agumbe greenstone terrane of WDC.…”

Section: Regional Geologymentioning

confidence: 99%

An appraisal of geochemical signatures of komatiites from the greenstone belts of Dharwar Craton, India: Implications for temporal transition and Archean upper mantle hydration

2019

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Archean ultramafic–mafic magmatism associated with dynamic mantle melting processes represents an integral part of crustal evolution and continental growth. Archean mantle plumes and their high temperature derivatives in komatiitic magmas provide a cornerstone in understanding the thermal and chemical evolution of the early Earth and its mantle. In this study, we evaluate the geochemical characteristics of the temporally distinct Sargur Group and Dharwar Supergroup greenstone belts of Dharwar Craton in southern India. The komatiites associated with these greenstone belts are characterized by Al‐depleted and Al‐undepleted compositions. Their MgO, Ni, Co, and Cr concentrations reflect primitive, undifferentiated nature of precursor melts, whereas the HFSE and REE chemistry corroborates high‐degree (30–50%) partial melting of mantle with prominent role of majorite garnet and perovskite in the generation of komatiitic melts. The Al‐depleted komatiites were formed at a greater depth (~13 GPa) by equilibrium melting leaving a garnet‐bearing residue. The resultant komatiitic melt retained buoyancy under extreme pressure and high temperature conditions, segregated and accumulated in the ambient peridotite mantle source and subsequently escaped with progressive decrease in pressure in the ascending plume. The Al‐undepleted and relatively rare Al‐enriched komatiites were derived by fractional melting at intermediate to shallow depths after the discharge of a large proportion of melt ensued by the collapse and entrance of residual garnet into the melt phase. The Mesoarchean–Neoarchean Dharwar komatiites provide evidence for heterogeneous, hydrated Archean upper mantle trapped by ascending mantle plumes. The non‐plume, arc‐related signatures invoke contributions from (a) sub‐cratonic lithospheric mantle roots influenced by ancient subduction events and (b) hydrated Archean upper mantle. The Sargur Group and Dharwar Supergroup komatiites record a distinct temporal transition and geochemical heterogeneity in the Archean mantle beneath the Dharwar Craton and can be attributed to Archean upper mantle hydration by flat slab subduction of >3.3 Ga oceanic crust at shallow level with vestiges of primordial oceanic crust forming deep cratonic mantle roots beneath the Dharwar Craton. The temporal transition towards mantle hydration beneath Dharwar Craton during the Mesoarchean can be correlated with the onset of subduction‐driven plate tectonics and ocean–crust–mantle interactions.

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“…Saha et al (2015) studied samples from the Bababudan greenstone belt of western and Gadwal greenstone belt of the eastern Dharwar craton (EDC) and found that the Bababudan komatiites have Ni (509-1066 ppm) and Cr (136-3036 ppm) and low RPGE (9-42 ppb) contents and are geochemically analogous to Al-undepleted Munro type komatiites and their PGE compositions similar to Alexo and Gorgona komatiites. The sulphur undersaturated character of Bababudan komatiites is attributed to decompression and assimilation of lower crustal materials during magma ascent and emplacement.…”

Section: Archean-proterozoic Volcanismmentioning

confidence: 99%

Volcanism, Past and Present – The Indian Scenario

Duraiswami

Gadpallu²

2016

Proceedings of the Indian National Science Academy

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Indian geoscientists continue to study volcanism in the sub-continent under three distinct theme-based time periods i.e. Archean-Proterozoic volcanism, Late Mesozoic Deccan Traps and Prehistoric Barren Island volcanism. The physical volcanology, geochemistry, isotopic systematics and economic potential constitute thrust areas for komatiites research in the Dharwar and Singbhum cratons. Similarly, the geochemistry and geochronology of basalts and boninites from Chitradurga, Veligallu, Kutti, Gadwal, Jonnagiri and Kolar greenstone belts continue unabated. The Mesozoic Deccan Trap lavas and interflow boles have captivated the attention of a small but significant group of Indian geoscientists. Papers related to several aspects such as the physical volcanology, geochemistry, geochronology and magnetics of basalts, rhyolites and boles have been published. A first time report of occurrence of pelletal lapilli from one of the world's largest crater-facies kimberlites at Bejripadar Tokapal Kimberlite field is significant. Radiogenic dating of kimberlite-lamproite magmatism from Mainpur,Wajrakarur and Kutch suggest a close spatio-temporal association between these deep-seated mantle messengers and large CFB provinces during the Cretaceous. A small group of dedicated Earth Scientists continue to work on the tuffs and basaltic andesite lavas from the prehistoric Barren Island Volcano.

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Platinum Group Elements (PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: Implications for mantle melting processes

Cited by 32 publications

References 156 publications

Metallogeny

Metallogeny

An appraisal of geochemical signatures of komatiites from the greenstone belts of Dharwar Craton, India: Implications for temporal transition and Archean upper mantle hydration

Volcanism, Past and Present – The Indian Scenario

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